andreiglingeanu opened a new issue #1971: rewrite_css filter minifies CSS Custom Properties URL: https://github.com/apache/incubator-pagespeed-mod/issues/1971 Hello, With the `rewrite_css` filter enabled, [CSS Custom Property](https://developer.mozilla.org/en-US/docs/Web/CSS/--*) definitions are broken -- their definition is lowercased. This is wrong because the css variables [are case sensitive](https://drafts.csswg.org/css-variables/#apis). That is variables `--test` and `--Test` are two different variables. Inline `<style>` tag before: ``` <style> :root { --testMeNow: 123px; } </style> ``` Inline `<style>` after: ``` <style>:root{--testmenow:123px}</style> ``` This obviously brokes the page because in actual CSS files the variables are referenced with `var(--testMeNow)` (no lowercase). Now I understand that this issue might be caused by the [`css_parser`](https://github.com/apache/incubator-pagespeed-mod/tree/master/third_party/css_parser/src) and please let me know if I have to redirect the report somewhere else -- I don't mind doing the legwork. The mod-pagespeed version is `1.13.35.2-0` (checked from the `X-Mod-Pagespeed` response header). Please advice on how to better move forward with this. Obviously, I would love to keep the `rewrite_css` filter enabled but because of this issue I have to keep it off for now.
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